fix(examples): update stale plugin-sdk paths after sdks/ restructure #152

Job	Run time
Skit / Test	8m 1s
Skit / Build	11m 11s
Plugins / Lint (NLLB)	2m 33s
Plugins / Lint (Sherpa-ONNX Plugins)	51s
Plugins / Format Check	16s
Skit / Lint (fmt + clippy)	5m 52s
E2E / Playwright E2E	4m 51s
UI / Lint (TypeScript + ESLint)	33s
UI / Test	22s
Plugins / Lint (Whisper)	43s
Plugins / Lint (Simple Plugins)	30s
UI / Build	23s
All Checks Passed	3s
	36m 9s

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